[Yoda]

I use the manzella one ball position....however there is a critical thing you have to remember:

As the club gets shorter, narrow up your stance.

Ben Doyle teaches one Ball Location with regards to the Left Heel -- specifically, "one inch inside." However, he simultaneously insists on varying Stance widths, e.g., Chip Shot width, Pitch Shot width, and so on. [This post assumes conventional positioning and does not apply to specialty Plane Line / Stance Line applications such as Cut Shots.]

Given the static Location with regards to the Left Heel, the wide Stance automatically locates the Ball forward in the Stance and narrow Stance locates it more back. Similarly, the wider Stance locates the Ball just behind Low Point (opposite the Left Shoulder) and the narrow Stance locates it well aft.

So, while Ben teaches a constant Ball Location with regards to the Left Heel, his methodology results in multiple Ball Locations with regards to the Left Shoulder. And in the end, that is all that matters.